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(11) | EP 1 293 763 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Method for maintaining uniformity among color measuring instruments |
| (57) A method for maintaining substantial reliability of color measurements obtained by
a number of color measuring instruments includes by measuring color values of a set
of master color standards 16 on a master color measuring instrument 14 at a master
color lab 10 and measuring color values of sets of working color standards 26 on the
same instruments to determine calibration values. The working sets are provided to
remote locations for use on remote color measuring instruments 24 and the working
sets are measured on the remote color measuring instruments 24 to obtain color value
measurements which are transmitted on the master color lab 10. The measurements from
the remote instruments 24 are compared with the calibration values obtained from measurements
on the master instrument 14 to generate profiles 28 which are provided to the remote
color labs 20. The profiles 28 are applied to measured color values for the set of
working color standards 26 to obtain corrected color values. These values are transmitted
to the master color lab and analyzed to determine compliance the specifications as
to permissible deviations. |